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Updated: Jul 13, 2025

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
Published on: September 19, 2020
Intrinsic-designed polyimide dielectric materials with large energy storage density and discharge efficiency at harsh
Yaya Tian1, Ming-Sheng Zheng1, Yuchao Li2
1Beijing Advanced Innovation Center for Materials Genome Engineering, School of Chemistry and Biological Engineering, University of Science & Technology Beijing, Beijing 100083, P. R. China. zhajw@ustb.edu.cn.
Abstract:
Polymer dielectric materials with excellent temperature stability are urgently needed for the ever-increasing energy storage requirements under harsh high-temperature conditions. In this work, a novel diamine monomer (bis(2-cyano-4-aminophenyl)amine) was successfully synthesized to prepare a series of cyano-containing polyimides (CPI-1-3), which possessed excellent dielectric properties and high thermostability. The maximum dielectric permittivity was up to 5.5 at 102 Hz for CPI-3, being 2.5 times higher than that of commercially used BOPP. In comparison, the CPI-1 exhibited an outstanding breakdown strength of 433 MV m-1 and a high energy density of 2.5 J cm-3 even at 250 °C, which was the highest value reported under the same conditions. The synthesized CPIs through such an intrinsic approach are potential candidate materials for energy storage and even other applications under simultaneously harsh electrical and thermal conditions.
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